What is diction?

an author's word choice

words that are inverted

tone and syntax together

formal language in poetry

Diction is the author's word choice.
So A, otherwise known as the first choice in your list. 
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The best and most correct answer among the choices provided by your question is the first choice or letter A "an author's word choice."

Diction refers to the writer's or the speaker's distinctive vocabulary choices and style of expression in a poem or story.

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Part- to -part

Explanation:

because I don’t know all I know it’s right cause I did the test